CN-121591458-B - All-steel slag pavement structure, preparation method and application

CN121591458BCN 121591458 BCN121591458 BCN 121591458BCN-121591458-B

Abstract

The invention provides an all-steel slag pavement structure, a preparation method and application thereof, wherein the all-steel slag pavement structure comprises a base layer, a lower base layer, an upper base layer, a lower layer, a middle surface layer and an upper layer, wherein aggregate is steel slag, the base layer is a graded steel slag layer comprising steel slag and water, the lower base layer and the upper base layer are cement stabilized steel slag layers comprising cement, steel slag and water, the lower layer and the middle surface layer are common asphalt mixture layers comprising matrix asphalt and steel slag, and the upper layer is a high-modulus asphalt mixture layer comprising high-modulus asphalt and steel slag. The invention carries out the structural design of the full steel slag pavement based on the unmodified steel slag, can prepare pavement structural materials by utilizing the steel slag on a large scale, and effectively improves the service performance and service life of the steel slag pavement structure.

Inventors

WU CHAOFAN
WAN SHU
YUAN XIN
QIU ZHEN
LI FEI
HAN QINGKUI
SUN BIN
XIAO GUANGWEN
LI QUAN

Assignees

湖南东数交通科技有限公司
湖南交通职业技术学院

Dates

Publication Date: 20260512
Application Date: 20260127

Claims (8)

1. The full steel slag pavement structure is characterized by comprising a base layer, a lower base layer, an upper base layer, a lower layer, a middle surface layer and an upper layer, wherein aggregate is steel slag; In the subbase layer, the mesh passing rate of 37.5mm, 4.75mm, 0.6mm and 0.075mm of steel slag is 100%, 52-70%, 18-30% and 8-15% respectively; In the lower base layer and the upper base layer, the mesh passing rate of 31.5mm, 26.5mm, 19mm, 9.5mm, 4.75mm, 2.36mm, 0.6mm and 0.075mm of steel slag is 100%, 91-100%, 83-90%, 59-77%, 41-59%, 24-34%, 15-26% and 5-10% respectively; In the lower layer, the mesh passing rate of 31.5mm, 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm of steel slag is 100%, 91-100%, 76-83%, 67-74%, 59-67%, 46-55%, 26-38%, 18-30%, 14-23%, 9-16%, 6-11%, 5-9% and 2-5%, respectively; In the middle surface layer, the sieve mesh passing rate of 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm of the steel slag is 100%, 91-100%, 78-85%, 63-71%, 51-61%, 28-41%, 17-31%, 13-23%, 9-16%, 6-11%, 4-9% and 2-5% respectively; in the upper layer, the mesh passing rate of steel slag of 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm is 100%, 91-100%, 69-77%, 39-53%, 26-37%, 16-27%, 11-19%, 8-14%, 5-10% and 2-6% respectively; The base layer comprises a base layer, an upper base layer and a lower base layer, wherein the base layer comprises steel slag and water, the mass ratio of the steel slag to the water is 91-94:6-9, the base layer comprises cement, steel slag and water, the mass ratio of the lower base layer to the upper base layer comprises 1-2:91-92:6-8, the base layer comprises asphalt and steel slag, the mass ratio of the lower base layer to the middle surface layer comprises 3-5:95-97, and the upper base layer comprises high-modulus asphalt and steel slag, and the mass ratio of the upper base layer to the upper base layer comprises 4-5:95-96.
2. The all-steel slag pavement structure according to claim 1, wherein the performance index requirements of the high-modulus asphalt in the mixture of the upper layer comprise penetration (25 ℃ 100g,0.1 mm) of 25-35, softening point (DEG C) of not less than 70, ductility (10 ℃ 5 cm/min) of not less than 20, kinematic viscosity (175 ℃ Pa.s) of not more than 1, residual penetration ratio after RTFOT (25 ℃ in percent) of not less than 70, residual ductility after RTFOT (10 ℃ cm) of not less than 10.
3. The all-steel slag pavement structure according to claim 1, wherein the apparent density of the steel slag is not less than 2.9g/cm 3 and the crushing value is not more than 20%.
4. The all-steel slag pavement structure according to claim 1, wherein the thickness of the base layer is 15-20 cm, the thickness of the lower base layer is 15-20 cm, the thickness of the upper base layer is 15-20 cm, the thickness of the lower layer is 8-10 cm, the thickness of the middle layer is 6-8 cm, and the thickness of the upper layer is 4-6 cm.
5. The all-steel slag pavement structure according to claim 1, wherein the subbase layer, the lower base layer, the upper base layer, the lower surface layer, the middle surface layer and the upper surface layer are sequentially arranged from bottom to top.
6. A method for preparing the all-steel slag pavement structure according to any one of claims 1 to 5, which is characterized by comprising the steps of obtaining the base layer, the lower base layer, the upper base layer, the lower surface layer, the middle surface layer and the upper surface layer, wherein all aggregate is steel slag, and paving the base layer, the lower base layer, the upper base layer, the lower surface layer, the middle surface layer and the upper surface layer from bottom to top.
7. The method for manufacturing the all-steel slag pavement structure according to claim 6, wherein a steel slag micro powder adhesive layer is arranged between the base layer and the lower base layer, a steel slag micro powder adhesive layer is arranged between the lower base layer and the upper base layer, an emulsified asphalt permeable layer is arranged between the upper base layer and the lower base layer, an SBS modified emulsified asphalt adhesive layer is arranged between the lower base layer and the middle surface layer, and an SBS modified emulsified asphalt adhesive layer is arranged between the middle surface layer and the upper surface layer.
8. Use of an all-steel slag pavement structure according to any one of claims 1-5 in road construction.

Description

All-steel slag pavement structure, preparation method and application Technical Field The invention relates to the field of highway engineering construction, in particular to an all-steel slag pavement structure, a preparation method and application. Background On one hand, the highway construction consumes the aggregate of the sand stone, so that ore resources are short, the conventional exploitation of the sand stone is difficult to meet highway construction requirements, and on the other hand, the overall recycling utilization rate of the steel slag is not high, and the reasonable use of the steel slag for road engineering construction is one of effective ways for solving the problems. However, because the steel slag contains free calcium oxide and magnesium oxide, the steel slag has certain expansibility, so that the stability is poor, and the steel slag is difficult to obtain a high-performance product after being directly used for road materials, and the prior art generally realizes the recycling utilization of the steel slag in asphalt mixtures by modifying the steel slag and combining the steel slag with other mineral aggregates. The Chinese patent application with the publication number of CN118324447A discloses a modified steel slag asphalt mixture and a preparation method thereof, wherein the mixture comprises 100 parts of steel slag aggregate, 6-8 parts of steel slag modifier, 4-6 parts of asphalt and 4-12 parts of mineral powder, the steel slag mixing amount in the steel slag aggregate is 75-100 wt%, the steel slag aggregate forms a skeleton of the modified steel slag asphalt mixture, a layer of steel slag modifier is adhered and coated on the surface of the steel slag aggregate, the steel slag modifier is adhered with asphalt to form a crosslinked space network structure, and the mineral powder is adhered on the asphalt. Although the patent application obtains an asphalt mixture product based on steel slag, the patent application still needs to modify the steel slag, needs to combine other mineral powder, and does not independently carry out structural design of an all-steel slag pavement based on unmodified steel slag. In view of the above, it is necessary to provide an all-steel slag pavement structure, a preparation method and an application thereof, so as to solve the technical problem of how to design the all-steel slag pavement structure based on unmodified steel slag. Disclosure of Invention The invention mainly aims to provide an all-steel slag pavement structure, a preparation method and application, and aims to solve the technical problem of how to design the all-steel slag pavement structure based on unmodified steel slag. The invention provides an all-steel slag pavement structure for achieving the aim, which comprises a base layer, a lower base layer, an upper base layer, a lower layer, a middle surface layer and an upper surface layer, wherein aggregate is steel slag; in the subbase layer, the mesh passing rate of 37.5mm, 4.75mm, 0.6mm and 0.075mm of steel slag is 100%, 50-70%, 15-30% and 7-15% respectively; In the lower base layer and the upper base layer, the mesh passing rate of 31.5mm, 26.5mm, 19mm, 9.5mm, 4.75mm, 2.36mm, 0.6mm and 0.075mm of steel slag is 100%, 90-100%, 81-90%, 57-77%, 39-59%, 22-34%, 12-26% and 5-10% respectively; In the lower layer, the mesh passing rate of 31.5mm, 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm of steel slag is 100%, 90-100%, 75-83%, 65-74%, 57-67%, 45-55%, 24-38%, 16-30%, 12-23%, 8-16%, 5-11%, 4-9% and 2-5%, respectively; In the middle surface layer, the sieve mesh passing rate of 26.5mm, 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm of the steel slag is 100%, 90-100%, 78-85%, 62-71%, 50-61%, 26-41%, 16-31%, 12-23%, 8-16%, 5-11%, 4-9% and 2-5% respectively; In the upper layer, the mesh passing rate of steel slag of 16mm, 13.2mm, 9.5mm, 4.75mm, 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm is 100%, 90-100%, 68-77%, 38-53%, 24-37%, 15-27%, 10-19%, 7-14%, 5-10% and 2-6% respectively. Further, the mixture of the bottom layer comprises steel slag and water, the mixture of the lower base layer and the upper base layer comprises cement, steel slag and water, the mixture of the lower layer and the middle surface layer comprises matrix asphalt and steel slag, and the mixture of the upper layer comprises high-modulus asphalt and steel slag. Further, the mass ratio of steel slag to water in the mixture of the base layer is 91-94:6-9, the mass ratio of cement, steel slag and water in the mixture of the lower base layer and the upper base layer is 1-2:91-92:6-8, the mass ratio of matrix asphalt to steel slag in the mixture of the lower layer is 3-5:95-97, the mass ratio of matrix asphalt to steel slag in the mixture of the middle layer is 3-5:95-97, and the mass ratio of high-modulus asphalt to steel slag in the mixture of the upper layer is 4-5:95-96. Further, in th